CN113376397A - Ultrahigh rotating speed measuring device and method for ultralow temperature liquid hydrogen pump - Google Patents
Ultrahigh rotating speed measuring device and method for ultralow temperature liquid hydrogen pump Download PDFInfo
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- CN113376397A CN113376397A CN202110477840.7A CN202110477840A CN113376397A CN 113376397 A CN113376397 A CN 113376397A CN 202110477840 A CN202110477840 A CN 202110477840A CN 113376397 A CN113376397 A CN 113376397A
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- rotating speed
- inducer
- eddy current
- speed coil
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/49—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/96—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by specially adapted arrangements for testing or measuring
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to an ultra-high rotating speed measuring device and method for an ultra-low temperature liquid hydrogen pump, wherein the device comprises a pump shell, an induction wheel sleeve, an induction wheel, an eddy current type rotating speed coil and a sealing gasket; the inducer is directly fixed at the end part of the shaft through a fastener and is arranged in the inner cavity of the pump shell, and the inducer is fixedly sleeved in the inner cavity of the pump shell without changing the flow field of the inducer; the inducer sleeve is provided with a blind hole relative to the outer side of the inner cavity of the pump shell; the eddy current type rotating speed coil is placed in the blind hole, a gap is reserved between the eddy current type rotating speed coil and the bottom of the blind hole, the eddy current type rotating speed coil and the pump shell are fixed in a sealing mode, the position of the eddy current type rotating speed coil is opposite to the blade tip of the inducer, and the rotating speed value of the inducer is obtained through the electric turbine principle.
Description
Technical Field
The invention relates to the technical field of aerospace, in particular to a non-magnetic rotating speed measuring device of a liquid hydrogen pump which runs at ultrahigh rotating speed in extremely-low-temperature liquid hydrogen.
Background
Currently, China is gradually implementing important space plans such as moon exploration, Mars exploration and even moon landing, and traditional aerospace strong countries, including the United states, also continuously start various space exploration projects. For any country, the most effective and strongest rocket propulsion at the present stage still depends on energy generated by chemical fuel combustion, and liquid hydrogen/liquid oxygen is used as the fuel with the highest specific impulse and has no alternatives. The turbine pump is one of the core technologies which have the greatest influence on the performance and reliability of the engine as a key component for conveying liquid hydrogen, liquid oxygen and medium.
The rotation speed measuring principle widely adopted at present is that a magnetic bar is arranged in a shaft system, a rotation speed coil is arranged on a shell, when the shaft system rotates at a high speed, the rotation speed coil cuts a magnetic induction line generated by the magnetic bar, so that a voltage value in sinusoidal distribution is generated, and the rotation speed value can be obtained after the voltage value is output and processed.
In order to pursue high energy density indexes, the rotating speed of the hydrogen turbine pump is continuously improved, a shaft end screw in the conventional rotating speed measuring system is required to be screwed into a shaft end screw for internally arranging a magnetic rod, and the design of the high-speed dynamic characteristic of the shaft system faces to a boundary increasingly due to the long cantilever length, so that the difficulty is increased more and more. In addition, the traditional rotating speed coil has larger volume, and is not ignored for the aerospace product which is 'pewter and pewter'.
Therefore, a more advanced measurement means is urgently needed to be adopted, a measurement system is simplified, the length of a shafting cantilever is shortened, the safety margin of high-speed dynamic characteristic design is greatly improved, and meanwhile, the weight reduction is facilitated.
Disclosure of Invention
The technical problem solved by the invention is as follows: the invention provides an ultrahigh-speed non-magnetic speed measuring device for an ultralow-temperature liquid hydrogen pump, which aims to simplify a shaft system and solve the problem of insufficient safety margin of high-speed dynamic characteristics of the shaft system.
The technical scheme of the invention is as follows: an ultra-high rotating speed measuring device for an ultra-low temperature liquid hydrogen pump comprises a pump shell, an induction wheel sleeve, an induction wheel, an eddy current type rotating speed coil and a sealing gasket;
the inducer is directly fixed at the end part of the shaft through a fastener and is arranged in the inner cavity of the pump shell, and the inducer is fixedly sleeved in the inner cavity of the pump shell without changing the flow field of the inducer; the inducer sleeve is provided with a blind hole relative to the outer side of the inner cavity of the pump shell; the eddy current type rotating speed coil is placed in the blind hole, a gap is reserved between the eddy current type rotating speed coil and the bottom of the blind hole, the eddy current type rotating speed coil and the pump shell are fixed in a sealing mode, the position of the eddy current type rotating speed coil is opposite to the blade tip of the inducer, and the rotating speed value of the inducer is obtained through the electric turbine principle.
Further, the eddy current type rotating speed coil is wound by a lead winding process and then fixed by a low-temperature resin curing process; the low temperature corresponds to the working environment of the liquid hydrogen pump, and the good adhesion can be still ensured at the low temperature of 253 ℃ below zero.
Furthermore, the wire winding process is deboned winding, and an internal supporting framework structure is not required to be added.
Further, the A glue and the B glue in the epoxy resin are fully and uniformly mixed according to the weight ratio of 1:1, and are cured for 4 hours at the temperature of 40 +/-5 ℃.
Furthermore, the range of the gap between the rotating speed coil and the bottom of the blind hole is 0.5-1 mm.
Furthermore, the thickness range of the bottom of the blind hole is 1-1.5 mm.
Furthermore, the pump shell is provided with a threaded hole, the position of the threaded hole is consistent with the position of a blind hole in the inducer, the threaded hole is provided with a sealing circular groove, the rotating speed coil and the pump shell are screwed and connected through the threaded hole, and sealing is realized through a sealing gasket and a sealing ring arranged in the sealing circular groove.
A rotation speed measuring method using the apparatus, comprising the steps of:
a rocket direct-current power supply is used for exciting and supplying power to a rotating speed coil through signal conditioning, and through the eddy current principle, when a metal blade tip of an inducer periodically skims the rotating speed coil, the rotating speed coil induces periodic variation generated by the eddy current effect to generate periodic signals, and the periodic signals are output and processed to obtain a rotating speed value.
The measuring device monitors the rotating speed in real time, the inducer is provided with 2 blades, and if n signals are obtained when the turbopump rotates for one circle, the rotating speed of the shaft is n/2.
Compared with the prior art, the invention has the beneficial effects that:
by utilizing the structural characteristics of shafting parts of the hydrogen turbopump, and adopting the eddy current type rotating speed coil with smaller structural size, the ultra-high rotating speed can be measured at high precision, the excellent ultra-low temperature sealing performance can be ensured, meanwhile, the induction wheel flow field is not influenced, and the structural universality is very strong.
(1) And shaft end screws for internally arranging magnetic rods are eliminated, and the length of the cantilever is shortened. Compared with the original rotating speed measuring device (shown in figure 1), the length of a shaft end cantilever of the new rotating speed measuring device (shown in figure 2) is shortened by 16.5%, the concentrated mass is reduced by 37.5%, the safety margin of the high-speed dynamic characteristic is improved by 60%, the working rotating speed distance of the hydrogen turbine pump is obviously far away from the third-order critical rotating speed, the vibration amplitude of a rotor in a working state is directly reduced, and the high-speed stability and the reliability of a shafting are effectively improved.
(2) The eddy current type rotating speed coil adopting the special wire winding and low-temperature resin curing process can keep high response frequency and high precision under ultralow-temperature liquid hydrogen. The working environment temperature of the rotating speed coil is ultralow temperature liquid hydrogen (-253 ℃), all materials can undergo shrinkage process in the process from a normal temperature assembly environment to a low temperature working environment, but the materials are different, and the shrinkage is different, so that the new rotating speed coil adopts a wire deboning and winding process, the framework structure for supporting the wire is reduced, the wire is prevented from being excessively stretched in the shrinkage process, meanwhile, the wire is fixed in the shell by adopting a special low temperature resin curing process, the high response frequency and high precision of not less than 5kHz can be kept under the vibration magnitude of about 200g of the hydrogen turbopump when an engine works, and the working frequency of the hydrogen turbopump is completely covered and has enough safety margin.
(3) A layer of induction wheel sleeve can be arranged between the rotating speed coil and the ultrathin blade tip of the induction wheel at intervals, and the induction wheel sleeve does not need to be punched. The radius clearance between the inducer sleeve and the inducer is 0.5mm, and the distance between the new rotating speed coil and the ultrathin blade tip of the inducer is 2.5mm, so that the inducer can be used for processing a blind hole, the distance between the new rotating speed coil and the bottom surface of the blind hole is set to be 0.5mm, the thickness of the blind hole can be kept to be 1.5mm, and the flow field of the inducer is not influenced. For the ultra-high performance hydrogen pump, the integrity of the inducer flow field is guaranteed to be important for the cavitation erosion resistance of the hydrogen pump.
(4) For the upper stage rocket engines, engine weight reduction may directly contribute to an increase in the thrust-to-weight ratio of the engine and an increase in the payload. In the novel rotating speed measuring device, the structural size of the shaft end screw and the rotating speed coil is greatly reduced, and the weight of a corresponding product is effectively reduced.
(5) The operating principle of the eddy current rotating speed coil is eddy current effect, when the turbopump runs, the magnetic flux of the inducer changes, induced current is generated in the inducer, the current is automatically closed in the inducer, namely eddy current is generated, a magnetic bar is not required to be arranged in the turbopump, and the problem that the rotating speed of the turbopump cannot be measured due to the magnetic bar loss and the like is avoided.
Drawings
FIG. 1 is a diagram of a conventional magnetoelectric induction type rotation speed measuring apparatus;
fig. 2 is a diagram of a novel eddy current type rotation speed measuring device provided by the invention.
In the figure: 1-pump shell; 2-shaft end screw; 3-inducer; 4, inducing a wheel sleeve; 5-eddy current type rotating speed coil; 6, sealing gaskets; 7-original shaft end screw; 8-original rotation speed coil; 9-original sealing gasket; 10-original magnetic rod.
Detailed Description
The invention is further described below with reference to the figures and examples.
An ultra-high rotating speed measuring device for an ultra-low temperature liquid hydrogen pump comprises a pump shell 1, an induction wheel sleeve 4, an induction wheel 3, a rotating speed coil 5 and a sealing gasket 6. The pump shell comprises a threaded hole, a sealing circular groove and a circle of sealing thorns, the sealing gasket is placed in the sealing circular groove, and the rotating speed coil is screwed and connected with the pump shell through the threaded hole; the induction wheel sleeve comprises a blind hole (shown in figure 2), and the distance between the end face of the rotating speed coil and the bottom surface of the blind hole is 0.5-1 mm; after the inducer is installed, the radius clearance between the inducer blade tip and the inducer sleeve is 1 mm. According to the invention, a built-in magnetic bar at the shaft end is eliminated, and a common screw 2 is used for replacing a shaft end screw with the built-in magnetic bar, so that the length of a shafting cantilever is greatly shortened, the safety margin of the high-speed dynamic characteristic of the shafting is obviously improved, and the working stability and reliability of the hydrogen turbine pump are greatly improved. The eddy current type rotating speed coil adopts a lead deboning winding process, so that a skeleton structure for supporting a lead is reduced, the lead is prevented from being excessively stretched in a contraction process, and meanwhile, the lead is fixed in a shell by adopting a special low-temperature resin curing process, so that the ultralow temperature (-253 ℃) of liquid hydrogen can be resisted, and the response frequency and the measurement precision of more than 5kHz can be kept. The low-temperature resin curing process parameters are as follows: the A glue and the B glue in the epoxy resin are fully and uniformly mixed according to the weight ratio of 1:1, and are cured for 4 hours at the temperature of 40 +/-5 ℃.
A rocket direct-current power supply is used for exciting and supplying power to the rotating speed coil through a signal conditioning circuit, and by the eddy current principle, when the ultra-thin metal blade tip of the inducer periodically skims the rotating speed coil, the rotating speed coil can induce periodic variation generated by the eddy current effect to generate periodic signals, and the rotating speed value can be obtained after the periodic variation is output and processed. In addition, a layer of non-metal induction wheel sleeve 4 can be arranged between the rotating speed coil 5 and the blade tip of the induction wheel, and the induction wheel sleeve does not need to be punched through, so that the flow field of the induction wheel can be not interfered at all, and the cavitation erosion resistance of the hydrogen pump can be ensured. Compared with the traditional rotating speed coil, the structure size of the eddy current type rotating speed coil is greatly reduced, and the weight of an engine is directly reduced.
The invention applies the eddy current rotating speed coil to the ultra-low temperature liquid hydrogen pump, does not need to arrange a traditional magnetic bar on a rotating shaft, can realize the induction of the ultra-thin blade by separating a layer of flow guide sleeve made of non-metallic materials, can reliably detect weak eddy current signals in the ultra-low temperature environment, has the response frequency of 5000Hz, greatly optimizes the high-speed dynamic characteristic of the rotor, simplifies the rotor design, avoids the interference of the flow field and lightens the weight of the hydrogen pump.
In the hydrogen turbopump assembling process, install induction wheel cover on the pump casing earlier, then screw up novel speed coil on the pump casing, carry out low temperature through sealed the pad and seal, guarantee that speed coil and induction wheel cover are sheathe in the distance of blind hole bottom surface and be 0.5 mm.
The invention has not been described in detail in part in the common general knowledge of a person skilled in the art.
Claims (9)
1. The utility model provides an ultra-high rotational speed measuring device for ultra-low temperature liquid hydrogen pump which characterized in that: comprises a pump shell, an induction wheel sleeve, an induction wheel, an eddy current type rotating speed coil and a sealing gasket;
the inducer is directly fixed at the end part of the shaft through a fastener and is arranged in the inner cavity of the pump shell, and the inducer is fixedly sleeved in the inner cavity of the pump shell without changing the flow field of the inducer; the inducer sleeve is provided with a blind hole relative to the outer side of the inner cavity of the pump shell; the eddy current type rotating speed coil is placed in the blind hole, a gap is reserved between the eddy current type rotating speed coil and the bottom of the blind hole, the eddy current type rotating speed coil and the pump shell are fixed in a sealing mode, the position of the eddy current type rotating speed coil is opposite to the blade tip of the inducer, and the rotating speed value of the inducer is obtained through the electric turbine principle.
2. The apparatus of claim 1, wherein: the eddy current type rotating speed coil is wound by a lead winding process and then fixed by a low-temperature resin curing process; the low temperature corresponds to the working environment of the liquid hydrogen pump.
3. The apparatus of claim 2, wherein: the wire winding process is deboned winding without adding an internal supporting framework structure.
4. The apparatus of claim 2, wherein: the low-temperature resin curing process parameters are as follows: the A glue and the B glue in the epoxy resin are fully and uniformly mixed according to the weight ratio of 1:1, and are cured for 4 hours at the temperature of 40 +/-5 ℃.
5. The apparatus of claim 1, wherein: the range of the gap between the rotating speed coil and the bottom of the blind hole is 0.5-1 mm.
6. The apparatus of claim 1, wherein: the thickness range of the bottom of the blind hole is 1-1.5 mm.
7. The apparatus of claim 1, wherein: the pump casing is provided with a threaded hole, the position of the threaded hole is consistent with the position of a blind hole in the inducer, a sealing circular groove is formed in the threaded hole, the rotating speed coil and the pump casing are screwed up and connected through the threaded hole, and sealing is achieved through a sealing gasket and a sealing ring arranged in the sealing circular groove.
8. A method of measuring a rotational speed using the apparatus according to any one of claims 1 to 7, characterized by comprising the steps of:
a rocket direct-current power supply is used for exciting and supplying power to a rotating speed coil through signal conditioning, and through the eddy current principle, when a metal blade tip of an inducer periodically skims the rotating speed coil, the rotating speed coil induces periodic variation generated by the eddy current effect to generate periodic signals, and the periodic signals are output and processed to obtain a rotating speed value.
9. The method of claim 8, wherein: the measuring device monitors the rotating speed in real time, the inducer is provided with 2 blades, and if n signals are obtained when the turbopump rotates for one circle, the rotating speed of the shaft is n/2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110477840.7A CN113376397B (en) | 2021-04-30 | 2021-04-30 | Ultrahigh rotating speed measuring device and method for ultralow temperature liquid hydrogen pump |
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| CN202110477840.7A CN113376397B (en) | 2021-04-30 | 2021-04-30 | Ultrahigh rotating speed measuring device and method for ultralow temperature liquid hydrogen pump |
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| CN113376397A true CN113376397A (en) | 2021-09-10 |
| CN113376397B CN113376397B (en) | 2023-02-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114439650A (en) * | 2022-01-17 | 2022-05-06 | 西安航天动力试验技术研究所 | Single-unit attitude and orbit control engine body cooling device and method |
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| US20110219741A1 (en) * | 2010-03-15 | 2011-09-15 | James Ernst | Determining fan parameters through pressure monitoring |
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| CN105545379A (en) * | 2015-12-09 | 2016-05-04 | 西安航天动力研究所 | Connection structure among inducing wheel, centrifugal wheel and rotor |
| CN108120848A (en) * | 2017-12-12 | 2018-06-05 | 中国航发动力股份有限公司 | A kind of aero-engine centrifuges sensor input speed test device |
| CN111828372A (en) * | 2020-06-23 | 2020-10-27 | 北京航天动力研究所 | Flexible rotor of ultrahigh-rotating-speed liquid hydrogen turbopump |
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2021
- 2021-04-30 CN CN202110477840.7A patent/CN113376397B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201106568Y (en) * | 2007-07-31 | 2008-08-27 | 陕西航天动力高科技股份有限公司 | High rotary speed centrifugal type self-sucking pump |
| US20110219741A1 (en) * | 2010-03-15 | 2011-09-15 | James Ernst | Determining fan parameters through pressure monitoring |
| CN102287398A (en) * | 2011-07-25 | 2011-12-21 | 中国航天科技集团公司第六研究院第十一研究所 | Small-sized high-speed centrifugal pump suitable for flow regulation in wide range |
| CN102856068A (en) * | 2012-09-03 | 2013-01-02 | 中国科学院电工研究所 | Making process of frameless superconducting coil |
| CN105545379A (en) * | 2015-12-09 | 2016-05-04 | 西安航天动力研究所 | Connection structure among inducing wheel, centrifugal wheel and rotor |
| CN108120848A (en) * | 2017-12-12 | 2018-06-05 | 中国航发动力股份有限公司 | A kind of aero-engine centrifuges sensor input speed test device |
| CN111828372A (en) * | 2020-06-23 | 2020-10-27 | 北京航天动力研究所 | Flexible rotor of ultrahigh-rotating-speed liquid hydrogen turbopump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114439650A (en) * | 2022-01-17 | 2022-05-06 | 西安航天动力试验技术研究所 | Single-unit attitude and orbit control engine body cooling device and method |
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